Receptacle and method of producing the same



May 8, 1934- F. KLINGER '1,958,005

RECEPTACLE' AND METHOD 0F PRODUCING THE SAME Filed July 2'?, 1933 2Sheets-Sheet, 1

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Patented Mayv` 8,' 1934 PATENT' AOFFICE'.

` v 1,958,005 nEcEPTAcLE AND METHOD or rRonUcING THE SAME

Friedrich Klinger, Hamburg, Germany Application July 2'?, 1933, SerialNo. 682,511 In Germany September 1, 1932 11 Claims.

The invention relates to the construction of and a process for themanufacture of envelopes of the lkind having a window enablinganinscription placed Within the envelope to be read 5 vand hereinafterreferred to as window envelopes. One mode of producing the window in theknown envelopes is to render a part of the front V of the envelopetransparent by impregnation with or application of agtransparentizingsolution of organic material such as resins or the like. The edge ofsuch a window is indefinite because the liquid spreads. Thus in order toobtain a pleasing appearance a broad black band surrounding the windowis printed on the front of the envelope.

It is also known to produce the window by cutting a correspondingaperture in the envelope and securing a transparent foil of cellulosederivatives or the like on the rear side by adhesives. This adhesivehowever does not afford a permanent connection and the transparent foilcan be detached from the window without great Vtrouble so that thecontents of the envelope are not completely protected.

Ordinary envelopes without lateral folds have already-been proposedwhich are closed laterally by intercorrug'ating and applying adhesive tothetwo surfaces; safety envelopesfpreventing unauthorized opening andclosing have been produced in that a number of layers of paper of theenvelope secured in superposition by adhesive or engaging one over theother in a dove-tail manner are secured together by means of a stampwith relief characters so .that the protuberances in one layer of paperengage in the corresponding protuberances in the layer above it. Herealso however the characters are applied only at the edge of the envelopeand not centrally as is thecase in securing windows.

According to the invention after a window aperturehas been' produced ina web in known manner a known transparent or translucent foil isconnected with the v.web not merely by adhesive asyis customary butLalso by means of corrugating or embossing bymeans of ribbed tools.

As'. in -the case of marginal reinforcement it is desirable to securethe` foil` to the window by adhesive before. the*` embossing operationand to perform the latter before vthe adhesive has fully. dried so thatthe known plastic toothing is 0btained. Window envelopes according tothe invention may be prepared either from a pile of separate'sheets orfrom a continuous paper web. In the latter case a travelling paper webwhich in the Customary manner is of a width equal to A(Cl. 93-61) amultiple of the width of one envelope; is first cut out in such way thatthe apertures for the windows are obtained at the appropriate positionswhereupon adhesive is applied to the aperturey for the window as well asto the requisite positions 6U on the envelope; a foil transparent ortranslucent material is now secured to the window by adhesive and isfirmly xed to the envelope by embossing and finally the individualenvelopes `are separated from the web by stamping out, cutting or thelike.

It is possible to provide a window according to the invention inenvelopes both with and without lateral folds. f

Certain embodiments of the invention are shown by way ofexample in theaccompanying drawings:

Fig. 1 shows an envelope with lateral folds after the lateral folds.andthe aperture for the window have beencut out. 75 Fig. 2 is a sectionalong the line I-II of Fig. 1.

Fig. 3 shows a view of the same envelope after a transparent foil hasbeen applied to the window aperture. l

Fig. 4 shows an enlarged section along the line III-IV of Fig. 3.

Fig. 5 shows a view of the same envelope with the window secured byembossing..

Fig. 6 shows an enlarged section along the line V-VI of Fig. 5.y

Fig. 7 lshows another embodiment for producing window envelopes inaccordance with the invention from a travelling paper web.

.Fig 8 shows schematically the production of envelopes or the likewithout lateral folds from a continuous web in accordance with theinvention, the lateral edges of the envelopes being joined bycorrugating or embossing.

Fig. Q re'presents the working operations on a travelling paper web inthe method illustrated in Fig. 8. A f

Fig. 10 shows a window envelope according to theinvention withoutlateral folds and with the corrugations' joining the envelope disposeddirectlyvat 'the edges.

VFig. 11 shows an envelope in which the corrugating-is effected at acertain distance from the edge.

As seen from Figs. 1-6 an envelope blank 1 with lateral folds 2, 3, 4and 5 is produced from a 105 sheet of paper by stamping or severingoperations and an aperture 6 for the window isprovided in the blank. Asshown in Figs. 3 and 4 this aperture is preferably first provided withan adhesive margin '7 on which is secured a 11o transparent foil 8extending beyond the window aperture by the width of the adhesive marginas is shown in Figs. 3 and 4.

The foil 8 is now firmly joined to the envelope l, Fig. 5, by acorrugation 9. Preferably the embossing is eiected while the adhesive at7 is still moistv so that an intimate connection ofthe adhesive with theindividual bres of the paper and the transparent foil occurs and anextremely iirm closure is obtained which cannot be released withoutdamaging the envelope or the window.

The envelopes with lateral folds may also be produced in accordance withthe invention in known manner from a paper web as shown in Fig. 7. Ifdesired a number of envelopes can be produced simultaneously side byside.

In therst place an aperture for a window 11 is cut out from the paperweb 10 by a suitable machine; the edge of the aperture is provided witha stripe of adhesive 12 and preferably at the same time the envelope isalso provided with stripes of adhesive at the points 13 which are to bestuck. The web 10 may conveniently be drawn oii from a roll. Then asshown at 14, the foil which is cut or stamped out to the requisite sizeis stuck on the window aperture and firmly connected with the envelopeat 15 by an embossing or corrugating operation. The manner in which theindividual envelopes are severed or separated from the continuous paperweb is indicated at 16. In order to obtain a complete envelope it is nowonly necessary to fold over the lateral folds 2', 3', 4' and 5 and tostick them together.

Another embodiment of the method according to the invention isrepresented schematically in Fig. 8. From a roll of paper 17 a paper webis guided over a guide roller 19 between co-operating rollers 20 and 20whereby the window aperture is cut out from the web. The paper web thenpasses between the rollers 21, 21'. Here the margin surrounding thewindow aperture is coated with adhesive. A web of transparent foil 23 isdrawn from a roll 22 and an appropriate section for covering the windowaperture is severed by the rollers 24, 25, 26 and applied or pressedagainst the window aperture by means of the rollers 27, 27 or by suctionmeans.

After this operation a second paper web from a roll of paper 28 isintroduced which by means of the adhesive rollers 3() is furnished withlongitudinal stripes of adhesive and by means of the roller 31 withtransverse stripes of adhesive at the points at which the lateral edgesare to be stuck together.

By means of a guide roller 32 the paper web 29 is superimposed on thepaper web 18 and thel two paper webs are joined at the lateral edges ofthe resultant envelopes by a corrugated or embossed edge 33, 33.Thereupon they are joined transversely of the paper web by embossingrollers 34, 34 and then separated into individual envelopes by severingrollers 35, 35 and 36, 36.

In order that this mode of operation should be more readily understoodthe varying stages are shown schematically on the paper web itself g inFig. 9. Here it can be seen that in the rst place the window aperturesare cut out at 37 and these apertures are provided with a margin ofadhesive at 38. At 39 the window of transparent foil is secured and isrmly fixed to the paper webs at 40 by embossing. Now the second paperweb is added which in the rst place is provided at 41 with stripes ofadhesive along which it is joined at 42 by corrugating or embossing. At43 the individual envelopes are severed from the length of the paper weband at 44 the individual envelopes are severed from one anothertransversely of the paper web.

The envelopes obtained in this Way have no lateral folds and areconnected at their lateral edges by corrugated strips 45 as shown inFig. 10. The corrugated strips 45 may be disposed directly at the edgeof the envelope as represented in Fig. 10. They could however bedisposed at a certain distance'from the edge as indicated in Fig. 11 at46. The lateral edges could also be connected in known manner byapplying adhesive and corrugating in which case the corrugating iseffected before the gum has completely at the edge of the envelopeopposite to the' closure ap.

The securing of the window by corrugation can be effected by means of anappropriately constructed embossing stamper with a correspondingcounter-stamp or by rollers provided with relief patterns constitutingembossing stamps, or the like.

Transparent or translucent foils of any suitable material may be usedfor the window. Thus for example use can be made of cellulosederivatives such as cellulose acetate, cellulose xanthogenate andcellulose hydrate, or of hardened gelatine products or products of thenature of parchment paper or in short all flexible elastic foils whichcould be termed glass skin or horn glass.

The production of window envelopes in accordance with the invention canbe carried out on la large scale in a continuous and efficient manner.and with a minimum of waste. The envelopes and windows are extremelyresistant and permanent and can be opened only by damaging the envelopeor the window. The envelopes and the windows can be made powder-tight sothat they are adapted for the production of sample bags and the like andalso coloured fo'ils can be used if it is desired to packlight-,sensitive materials.

` Whereas windows secured solely by adhesive readily fold or Wrinkle andgive rise to a wavy surface as is well known, whereby the deciphering ofthe writing beneath the window is made more diicult, it has been foundthat windows secured by embossing in accordance with the present in lanytype of paper or other thin Walled envelope,

bag or like receptacle. It may very effectively be applied to bags andother thin walled receptav cles such as those used for packing coffee,sugar, chocolate and other food-stuis, tobacco and the like. In suchcases the bag or receptacle is provided with an aperture covered withtransparent sheet material forming a window through which the goods maybe viewed. Such application of the invention not only provides anattractive conweapon tainer but obviates the necessity of opening thebag or receptacle to see what it contains.

I claim:

1. A receptacle comprising a front portion furnished with a windowaperture and a transparent foil covering said aperture and secured tothe surrounding portion of the envelope by corrugations impressed insaid foil and said surrounding portion.

2. A receptacle comprising a front portion furnished with a Windowaperture and a transparent foil covering said aperture and secured tothe surrounding portion of the envelope by adhesive applied between saidfoil and the surrounding portion of the envelope and by corrugationsimpressed in said foil and said surrounding portion.

3. A method for producing receptacles provided with a transparentwindow, including the steps of attaching a foil to the envelope blank byadhesive and securely fixing the foil by impressing a relief pattern inthe superimposed sections of said foil and envelope blank..

4. In the method for producing receptacles according to claim 3impressing the relief pattern before the adhesive has dried.

5. The method for producing window receptacles, from a continuous bandof material, including the steps of punching out window apertures,applying adhesive to the 'margins of said apertures, positioning a sheetof foil over each aperture in contact with said adhesive, impressing arelief pattern in the @superimposed layers of foil and band material andsevering said band between adjacent window apertures. y.

6. The methodrfor producing Window receptacles from a continuous band ofmaterial of Width corresponding to a number of envelopes, including thesteps of punching out window apertures, applying adhesive to the marginsof said 7. The method for producing window receptacles from a continuousband of material, including the steps of punching out Window apertures,applying adhesive to the margins of said apertures, severing foilwindows from a band of foil, superimposing said Windows on saidadhesived margins, impressing relief patterns in said superimposedportions, applying adhesive in stripes of predetermined location to afurther band of envelope material, superimposing said band on the rstband with the adhesive stripes in contact therewith, impressing reliefpatterns in said superimposed bands in register With said `adhesivestripes and severing bands between adjacent windows.

8. The method for producing window receptacles including the steps offorming window apertures, securing transparent windows thereto byadhesive and impressed relief patterns substantially as hereinbefore setforth.

9. A receptacle comprising a portion having a window aperture, a pieceof transparent sheet ma erial covering said aperture, said piece oftransparent material being secured to the portion surrounding saidaperture by corrugations impressed in said transparent material andsurrounding portions.

10. A receptacle comprising a portion provided with a Window aperture, apiece of transparent sheet `material covering said aperture, adhesivemeans between said transparent material and the edges surrounding saidaperture, and a series of corrugations impressed in said transparentmaterial and the edges surrounding said aperture to join saidtransparent material to said edges securely.

11. A method of producing receptacles provided with transparent windows,including the steps of attaching a piece of transparent material to ablank provided with an aperture by adhesive and securely fixing thetransparent material to the edges surrounding said aperture bycorrugations impressed in said transparent material and in said edges.

FRIEDRICH KLINGER.

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